One of the primary goals with libp2p P2P was to get it fully working in the browser and interopable with the versions running in Go and in Node.js.
Start by installing libp2p's dependencies.
> cd ../../
> npm install
> cd examples/libp2p-in-the-browser
Then simply go into the folder 1 and execute the following
> cd 1
> npm install
> npm start
# open your browser in port :9090